A good tip. Same as when you view tags in mp3tag. There is a + and - button there two. You can have several artworks per file. Only the first one is recognised by Sooloos, squeeze etc. (generally).

If you press the artwork button in dBpa then it will generally show you all the artwork that is available for that album. This is similar to what you get via google etc. however, if you select here then it becomes the only artwork for that album when you save.

Several options. Just need to know the slight tweaks to make each work best.

Rgds,
Nick